Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13.1541k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 13, Dec. 1986, p. 1541-1544. NASA-NSF supported research.
Physics
70
Earth Core, Geochemistry, High Pressure, Iron Oxides, Metallizing, Phase Diagrams, Boundary Layers, Chemical Equilibrium, Diamonds, Earth Mantle, Shock Waves
Scientific paper
The phase diagram of FeO has been experimentally determined to pressures of 155 GPa and temperatures of 4000 K using shock-wave and diamond-cell techniques. A metallic phase of FeO is observed at pressures greater than 70 GPa and temperatures exceeding 1000 K. The metallization of FeO at high pressures implies that oxygen can be present as the light alloying element of the earth's outer core, in accord with the geochemical predictions of Ringwood (1977 and 1979). The high pressures necessary for this metallization suggest that the core has acquired its composition well after the initial stages of the earth's accretion. Direct experimental observations at elevated pressures and temperatures indicate that core-forming alloy can react chemically with oxides such as those forming the mantle. The core and mantle may never have reached complete chemical equilibrium, however. If this is the case, the core-mantle boundary is likely to be a zone of active chemical reactions.
Jeanloz Raymond
Knittle Elise
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